body {
    background: linear-gradient( rgba(0, 0, 0, 0.2),rgba(0, 0, 0, 0.2)), url('images/1.png');
    background-position: center center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-size: cover;
}

@media only screen and (max-width: 767px) {
    body {
        background-image: url('images/1.png');
    }
}

